<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 提示区域 -->
      <el-alert title="添加商品信息" type="info" center show-icon :closable="false">
      </el-alert>

      <!-- 步骤条区域 -->
      <!-- 字符串-0来转换为number类型 -->
      <el-steps :space="200" :active="activeIndex-0" finish-status="success" align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品内容"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>

      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
        <!-- 垂直tab栏区域 -->
        <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
          <el-tab-pane label="基本信息" name="0">
            <el-form-item label="商品名称" prop="goods_name">
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop="goods_price">
              <el-input v-model="addForm.goods_price" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop="goods_weight">
              <el-input v-model="addForm.goods_weight" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop="goods_number">
              <el-input v-model="addForm.goods_number" type="number"></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop="goods_cat">

              <!-- 级联选择框 -->
              <el-cascader v-model="addForm.goods_cat" :options="catelist" :props="cateProps" @change="handleChange"></el-cascader>
            </el-form-item>
          </el-tab-pane>

          <el-tab-pane label="商品参数" name="1">
            <el-form-item v-for="(item) in manyTableData" :key="item.attr_id" :label="item.attr_name">
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox v-for="(cb,i) in item.attr_vals" :key="i" :label="cb" border></el-checkbox>

              </el-checkbox-group>
            </el-form-item>
          </el-tab-pane>

          <el-tab-pane label="商品属性" name="2">
            <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>

          <el-tab-pane label="商品图片" name="3">
            <!-- 图片上传 -->
            <!-- action表示图片上传的后台api地址 -->
            <el-upload :action="uploadUrl" :headers="headerObj" :on-preview="handlePreview" :on-remove="handleRemove" list-type="picture" :on-success="handleSuccess">
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>

          <el-tab-pane label="商品内容" name="4">
            <!-- 富文本编辑器 -->
            <quill-editor v-model="addForm.goods_introduce">
            </quill-editor>
            <!-- 添加商品按钮 -->
            <el-button type="primary" class="btn-add" @click="add">添加商品</el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>

    </el-card>

    <!-- 图片预览对话框窗口 -->
    <el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
      <img :src="previewPath" alt="" class="preview-img">
    </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
export default {
  data() {
    return {
      // 步骤条激活索引
      activeIndex: '0',
      // 添加商品的表单数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        // 上传的图片临时地址
        pics: [],
        // 商品介绍
        goods_introduce: '',
        // 商品参数
        attrs: []
      },
      addFormRules: {
        goods_name: [{
          required: true, message: '请输入商品名称', trigger: 'blur'
        }],
        goods_price: [{
          required: true, message: '请输入商品价格', trigger: 'blur'
        }],
        goods_weight: [{
          required: true, message: '请输入商品重量', trigger: 'blur'
        }],
        goods_number: [{
          required: true, message: '请输入商品数量', trigger: 'blur'
        }],
        goods_cat: [{
          required: true, message: '请选择商品分类', trigger: 'blur'
        }]
      },
      // 商品分类数据
      catelist: [],
      // 级联选择器配置
      cateProps: {
        expandTrigger: 'hover',
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 动态参数列表数据
      manyTableData: [],
      // 静态属性列表数据
      onlyTableData: [],
      // 上传图片的url
      uploadUrl: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 请求头
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 预览图片地址
      previewPath: '',
      // 控制预览图片对话框显示与隐藏
      previewVisible: false
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取所有商品分类数据
    async getCateList() {
      const { data: res } = await this.$http.get('categories')

      if (res.meta.status !== 200) return this.$message.error(('获取商品分类数据失败！'))

      this.catelist = res.data
      //   console.log(this.catelist)
    },
    // 级联选择器选中项发生变化会触发
    handleChange() {
      // 限制只能选择三级分类
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
      //   console.log(this.addForm.goods_cat)
    },
    // 切换标签之前的钩子，若返回 false 或者返回 Promise 且被 reject，则阻止切换。
    beforeTabLeave(activeName, oldActiveName) {
      //   console.log('即将进入的标签页：', activeName, '，即将离开的标签页：', oldActiveName)
      //   return false
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类！')
        return false
      }
    },
    // 点击tab触发
    async tabClicked() {
      //   console.log(this.activeIndex)
      // 点击动态参数
      if (this.activeIndex === '1') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'many' } })

        if (res.meta.status !== 200) return this.$message.error('获取动态参数列表失败！')

        res.data.forEach(item => {
          item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        console.log(res.data)
        this.manyTableData = res.data
      } else if (this.activeIndex === '2') {
        // 静态属性
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'only' } })

        if (res.meta.status !== 200) return this.$message.error('获取静态属性列表失败！')

        // console.log(res.data)
        this.onlyTableData = res.data
      }
    },
    // 处理图片预览事件
    handlePreview(file) {
      //   console.log(file)
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 处理移除图片的操作
    handleRemove(file) {
      // 1.获取将要移除图片的临时路径
      const filePath = file.response.data.tmp_path
      // 2.从pics数组中找到对应的索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 3.调用数组splice方法，把图片对象从数组中删除
      this.addForm.pics.splice(i, 1)
      //   console.log(this.addForm)
    },
    // 图片上传成功事件
    handleSuccess(response) {
      //   console.log(response)
      // 1.拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path }
      // 2.将图片对象push到pics数组中
      this.addForm.pics.push(picInfo)
      //   console.log(this.addForm)
    },
    // 添加商品
    add() {
      //   console.log(this.addForm)
      // 提交前预验证
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return this.$message.error('请填写必要的表单项')

        // 执行添加商品操作
        // lodash cloneDeep(obj)，深拷贝一份数据
        const form = _.cloneDeep(this.addForm)

        // 处理商品分类
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数、静态属性
        this.manyTableData.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals.join(' ') }
          this.addForm.attrs.push(newInfo)
        })
        this.onlyTableData.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs

        console.log(form)
        // 发起请求
        // 商品的名称必须是唯一的
        const { data: res } = await this.$http.post('goods', form)

        if (res.meta.status !== 201) return this.$message.error(res.meta.msg)

        this.$message.success('商品添加成功！')

        this.$router.push('/goods')
      })
    }
  },
  computed: {
    cateId() {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>

<style lang="less" scoped>
.el-checkbox {
  margin: 0 5px 0 0 !important;
}
.preview-img {
  width: 100%;
}
.btn-add {
  margin-top: 15px;
}
</style>
